broken/ fixed extruder

January 10, 2011 § 2 Comments

Because of inproper and to quick assembly I broke my old PTFE Thermal barrier.

It happend when the print head scrubbed over the new printed layer of PLA do to inproper alignement of the print bed vs. axes. You see – lot’s of inproper building. I fixed the extruder yesterday and also fixed the hot end like I should have done in the first place.

After some quick recalibration of the new Z-height I already did a new successful print test. Because I also changed the tiny gear (which’s original quality was very bad) I now have a continuous working extruder with quite better print quality. I think

it’s time to start printing some Hacklab Reprap parts and fine tune the print quality on the way.

Berlin Wolfstrap printing!

December 19, 2010 § Leave a comment

This was a very successful weekend 😉

Over the week I found some time to assemble the hot end.

First I wanted to put it together using some special Epoxy which is supposed to withstand up to 300 °C (TURBOKITT, BOLDT & CO OHG). But the I realized, that Kapton did the job quite well. I also attached cables (1 m – which turned out to be just long enough).

Next I assembled a temporary cold end. I turned out, that again, the connection of the threaded rod (bolt this time) and the stepper is quite difficult. This time even more, as there is perpedicular stress on the axis. My first attempt was to use the tube again (which proved to be quite ok in the Z-axis). I turned out to be close to absolutely non functioning in real prints. I had some serious alignement issues, which I tried to solve using the brass thingy again. It was still not perfectly aligned, resulting in and extrusion for about 180° and a stutter stepper for the remaing 180° (which this way required 80% of the time). I aggressively decreased the fill in distance in repstrapper to 1 mm and increased shell count to 2. For the final 1,5 parts I had to push the filament through the extruder manually. This was mainly because the creases in the bold got filled with PLA, so there was not enough drag anymore. Besides the extruder, the Wolfstrap did a very convincing job. I was also happy that PLA sticked very good to Kapton tape and I was also able to remove the printed parts quite well (ok, I destroyed the tape in one spot…) But look, what I got:
Yes! It’s a Wade’s Geared Extruder. The print quality is still very bad. But it feels solid and I’m quite positive it will be a way better extruder, than my currently dying temporary extruder. I hope to have it assembled before X-Mas. Then I just have to figure out, how to mount this beast to my Berlin Wolfstrap.

berlin wolfstrap progress

December 12, 2010 § Leave a comment

So – the Berlin Wolfstrap is doing fine. I got my long awaited package from mendel-parts.com right before the weekend and have my Gen6 electronics now.3 Axes are working now:As you can see – I still have trouble with the connection of the stepper and the threadded rod for the Z axis. I think I’ll change the brass dowel with a rubber/plastic tube.
Next thing to build is the extruder.I’ll try to build something like this. And I hope it will work for a least a print of Wades Geared Extruder. Also I need to assemble the hot end – I’ll try and use High Temp Paint to fix the insulated nichrome wire and the glass bead sensor. Btw: I wad really surprised how tiny the glass bead is (not even 1 mm)…..I’m really curious to see whether or not it will work, or just broke during shipping.

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